KR20000058150A - Disk recording system - Google Patents

Abstract

When recording is stopped on the disc in accordance with the reception of the received data, or when additional recording is made on the disc in accordance with the resumption of reception of new received data, the recording stops by adding specific data generated in the data generator 23. The interleaved length in each of the end block of the immediately received data and the start block of the received data immediately after the removal of the recording stop is secured. As a result, the end block of the received data is modulated into the recording data until recording stops, and the disc is recorded on the disc, and further recording is started from the recording data of the start block of the received data. Add and record new record data continuously without a link block.

Description

Disk recorder {DISK RECORDING SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a disc recording apparatus for recording record data subjected to error correction processing including interleaving to received data on a disc in units of a predetermined number of blocks, and in particular, it is possible to perform additional recording by seamlessly recording the record data in a continuous manner. The present invention relates to a disk recording apparatus.

As a disc recording apparatus for recording record data on a disc, a CD-R (Recordable) drive of the compact disc (CD) family is well known. In the case of a so-called write-once medium in which once-recorded data, such as a CD-R, cannot be physically erased, there is a problem that when recording data is interrupted, the area during the interrupted recording becomes unavailable. have.

Therefore, there is a demand for a disc recording method that enables additional recording in which the area during recording is not wasted even if the recording data is interrupted.

In the packet write method, recording can be performed on a packet basis, so that even if recording data is interrupted, additional recording can be performed without wasting the area in the middle of recording. However, the packet and write methods need to form link blocks as large as seven blocks for the connection between packets, and there is a problem in that the recording capacity of the disk is wasted.

If the recording data of the disc can continue to record continuous data after the interrupted data at the interrupted position without interruption, additional recording is achieved without wasting the recording area without employing the packet write method. .

By the way, the CD data recording data has been subjected to error correction processing of the CIRC (Cross Interleave Reed-Somon Code) system, and interleaved.

Since the interleave length is up to 108 frames, when the continuous data is recorded seamlessly after the interrupted data on the disc, the interleave length is not secured to the end block of the received data immediately before the recording stop of the recording data on the disc. In addition, there has been a problem that the interleave length is not secured in the start block of the received data immediately after the release of recording stop on the disc.

An object of the present invention is to provide an interleaving process for each of the end blocks of the received data immediately before the recording stop and the end blocks of the received data immediately after the start of additional recording. This allows further recording of data onto the disc without forming the link block.

In the present invention, when the recording stop on the disc can be stopped in accordance with the reception of the received data, the specific data is generated by the data generating means, and the specific data is added to the end block of the received data immediately before the recording stop. Secure the interleaved length of the end block. For this reason, data of the terminal block can be interleaved correctly, modulated into recording data, and recorded on the disk. In addition, in the present invention, when the reception of the reception data is resumed after the recording stop, the same data generation means generates the same specific data as when the recording is stopped, and the specific data is added to the start block of the reception data immediately after the reception resume. Thus, the interleaved length of the start block is secured. For this reason, data of the start block can be interleaved correctly, modulated into recording data, and recorded on the disc.

In particular, the recording start position detected by the recording start position detector is adapted to perform additional recording on the disk in synchronization with the recording data recorded on the disk by the synchronization setter. As a result, new recording data can be additionally recorded from subsequent positions without being cut off at the end of the recorded data.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing a configuration example of a disc recording apparatus according to the present invention.

Fig. 2 is a diagram for explaining a method of adding specific data (“0” data) immediately before recording stop and immediately after recording stop is released.

<Explanation of symbols for the main parts of the drawings>

1: optical head

4: decoder

5: sub code demodulation circuit

6: wobble decoder

8: disc motor

9: motor servo circuit

10: interface

12: encoder

14: laser drive circuit

15: system control circuit

16: access control means

17: buffer control means

18: recording control means

19: recording start position detecting means

20: synchronization setting means

21: power control means

22: block recognition means

23: data generating means

22: block recognition means

23: data generating means

1 is a circuit block diagram showing an example of a CD-R drive as one embodiment of a disc recording apparatus according to the present invention.

In Fig. 1, reference numeral 1 denotes an optical head which emits a laser beam that traces the disc, and writes and reads recording data to and from the disc, and reference numeral 2 denotes an optical head 1 by means of the optical head 1 An RF amplifier which amplifies an RF signal (high frequency signal) that can be obtained by reading recorded data, and binarizes the RF signal and outputs it as digital data, and reference numeral 3 is an optical head (2) through the RF amplifier (2). The optical head 1 itself is moved in the radial direction of the disc while feeding back the output of 1), focusing control for condensing the laser beam to the signal surface of the disc, and tracking control for following the laser beam to the signal track of the disc. A head servo circuit that performs thread feeding control for feeding.

Reference numeral 4 is a decoder that performs signal processing for demodulating digital data output from the RF amplifier 2, and reference numeral 5 is a sub code demodulation circuit for demodulating the separated sub code.

The decoder 4 demodulates the read data in synchronization with the bit clock reproduced from the data read from the disc, and the demodulation process can be performed without difficulty in the variation of the rotational speed of the disc.

Reference number 6 extracts a wobble component of 22.05 Hz from the pre-groove signal of the disc, which can be obtained through the RF amplifier 2, and generates the components necessary to control the rotation of the disc. Together, the wobble decoder includes an ATIP demodulation circuit 7 for demodulating ATIP (Absolute Time In Pre-groove) from the wobble component.

Reference numeral 8 is a disk motor for rotationally driving the disk, and reference numeral 9 is a motor servo circuit for driving control of the disk motor 8.

The motor servo circuit 9 can control the rotation of the disk on which the signal is recorded in a linear speed constant manner, and also control the rotation of the disk at constant angular velocity when the disk is reproduced. .

Reference numeral 10 denotes an interface for controlling the exchange of data with a host device such as a personal computer connected to the outside via the connection terminal 11, and reference numeral 12 denotes the received data received by the interface 10. Is an encoder that modulates the data into recording data for recording on a disk. The buffer RAM 13 caches data transmitted from the host device connected to the connection terminal 11, and is used when the encoder 12 modulates the recorded data to be recorded on the disk. The buffer RAM 13 is used to cache data read from the disk and to demodulate the data by the decoder 4.

The encoder 12 has a CD-ROM modulator for performing modulation based on the CD-ROM standard and a CD modulator for performing modulation based on the CD-DA standard. The CD-ROM modulator adds a sink, a header, an error detection code (EDC) of an error detection code for CD-ROM data, and an error correction code (ECC) of an error correction code to the received data. The CD modulator performs CIRC (abbreviation for Cross Interleaved Reed-Solomon Code), which is a CD type error correction code, on the data output through the CD-ROM modulator, adds a sub code, and further, EFM (Eight to Fourteen Modulation) process is performed to add a synchronization signal.

Reference numeral 14 denotes a laser drive circuit that drives the laser light source of the optical head 1 to perform recording on the disc based on the recording data of the EFM data output from the encoder 12.

Reference numeral 15 denotes a system control circuit for performing system control in accordance with recording and reproduction of a disc. The system control circuit 15 includes a sub code address of absolute time information in the sub code (sub Q data) demodulated by the sub code demodulation circuit 5 and an ATIP demodulated by the ATIP demodulation circuit 7. Access control means (16) for controlling access by selectively referring to the ATIP address of the absolute time information of &lt; RTI ID = 0.0 &gt;, &lt; / RTI &gt; Recording control means 18 for controlling the recording of recording data on the disk in accordance with the data storage capacity of the buffer RAM 13 by the means 17, and the head of an unrecorded area in which recording data is not recorded on the disk; The recording start position detecting means 19 for detecting the recording start position at which the recording control means 18 starts recording the recording data, and the synchronization signal and the sub code of the sub code extracted by the decoder 4; To the buffer control means 17 and to the synchronization setting means 20 for synchronizing the recording data newly recorded on the disk with the sub-Q data demodulated by the code demodulation circuit 5 to the recording data already recorded on the disk. Power supply control means 21 for controlling the power supply of a predetermined circuit according to the data storage capacity of the buffer RAM 13 and the interruption of the received data received by the interface 10 to detect a block of the received data. Block recognition means 22 and data generation means 23 for generating predetermined specific data, for example, "0", irrespective of the received data. This control circuit 15 is comprised of a microcomputer, and each means is comprised by execution 12 of software. However, it is also suitable to configure any means by a hardware circuit.

The power supply control means 21 reads data from each circuit enclosed by broken lines in FIG. 1, namely, the disk, and records each circuit of the reproduction system until demodulating the read data and the received data on the disk. The power supply of each circuit of the recording system until the modulation process is performed with the recording data and the recording data is recorded on the disk is controlled.

The disk recording apparatus configured in this manner executes a recording operation when the interface 10 receives data requiring disk recording.

When the write operation is executed, the system clock of the recorder becomes the reference clock of crystal oscillation precision.

The optical head 1 is controlled to read the pregroove signal of the disc by the laser output for disc reproducing, and the pregroove signal read out from the optical head 1 is waveform-shaped by the RF amplifier 2 and then wobbles The wobble component is extracted by the decoder 6, and the ATIP is demodulated by the ATIP demodulation circuit 7 from the wobble component.

When data for requesting recording is transmitted from the host device connected to the connection terminal 11, the data is received by the interface 10 and recorded in the buffer RAM 13.

The received data received by the interface 10 is received for each block unit. If the number of blocks of data recorded in the buffer RAM 13 reaches the predetermined number of blocks set in advance as a recording unit for recording to the disk by the block recognition means 22, the data recorded in the buffer RAM 13 Then, the predetermined number of blocks is integrated and modulated into the record data of a type that should be recorded on the disc by the encoder 12.

When the position traced by the laser beam of the optical head 1 comes to the recording position of the disc, recording data is sequentially output from the encoder 12 in units of EFM frames, and address data indicating an address corresponding to the output recording data. Are sequentially updated and stored in the address memory 15a provided in the system control circuit 15.

The laser drive circuit 14 drives the laser light source of the optical head 1 based on the recording data output from the encoder 12, whereby recording of the recording data onto the disc is performed.

By the way, when the received data is interrupted and the buffer underrun occurs, or when the reception of the data requesting the recording is finished, the data processing of the received data by the encoder 12 cannot be performed, and the recording control means 18 determines to stop recording to the disc, stops data processing by the encoder 12, stops the emission of the recording beam from the optical head 1, and stops recording to the disc. Is stopped.

Here, the data generating means 23 generates &quot; 0 &quot; data when the recording stop on the disk is performed in accordance with the reception of the received data, and when additional recording is performed on the disk by resuming reception of new received data. In the end block of the received data immediately before the recording stop on the disc and the start block of the received data immediately after the release of the recording stop on the disc, data that is short of the CIRC interleave length (up to 108 frames in the EFM frame) is stored. Supplemented with "0" data, the data necessary for CIRC processing is secured.

Since the interleave length of the CIRC scheme is a maximum of 108 frames, data in a block may be delayed by a maximum of 108 frames according to CIRC processing. Therefore, if one block is composed of 98 frames of EFM frames, such as CD-ROM data, in order to accurately CIRC the delayed data as accurately as possible, two blocks after the end block of the received data immediately before the recording stop on the disk are included. "0" data is required. In addition, "0" data for two blocks is required similarly to the start block conduction of the received data after the recording stop release operation on the disc. Therefore, when the end block and the start block are subjected to data processing by the encoder 12, "0" data for two blocks are generated from the data generating means 23 and supplied to the encoder.

Therefore, the terminal block of the received data received by the interface 10 until immediately before the recording stop of the disc is CIRC-processed by the encoder 12 together with the "0" data generated from the data generating means 23, and modulated into the record data. , Is written to disk.

On the other hand, when the output of the write data from the encoder 12 is stopped, address data corresponding to the address of the last frame of the write data output from the encoder 12 immediately before the stop of recording is stored in the address memory (in the system control circuit 15). It is remembered in 15a). The stored address data includes time information of the Q channel data (sub Q data) of the sub code and address information indicating the number of the EFM frame in the time information. Then, the synchronization setting means 20 sets the address of the recording data of the last frame recorded on the disk by the address data stored in the address memory 15a, and the time information of the sub-Q data is at what time, how many minutes and how many frames. Manage which number of EFM frames is in the information.

When the next data to be recorded is received at the interface ID during recording stop on the disc, additional recording of the disc is performed.

When the next data requiring recording is received at the interface 10, the access control means 16 accesses the recording data recorded on the disk until immediately before the recording stop, using the ATIP demodulated by the ATIP demodulation circuit 7, The trace by the optical head 1 is started.

When the trace is started, the pit signal formed by writing to the disc is read by the head 1, and EFM data can be obtained from the RF amplifier 2.

Then, the system clock is switched to the reproduction clock synchronized with the EFM data, and the demodulation processing by the decoder 4 and the modulation processing by the encoder 12 are performed in synchronization with the reproduction clock.

When data to be recorded is received at the interface 10 and the data recorded in the buffer RAM 13 incorporates a predetermined number of blocks, the encoder 12 resumes the modulation processing operation and resumes the creation of the recording data. .

On the other hand, when the disc is traced and the EFM data is input to the decoder 4, the synchronization signal of the sub code is extracted by the decoder 4 and the sub Q data is demodulated by the sub code demodulation circuit 5. . Synchronization of the recording data output from the encoder 12 by the synchronization setting means 20 with respect to the recording data already recorded on the disc using the synchronization signal and the sub-Q data is adopted.

During the period until this synchronization is adopted, new received data is processed by the encoder 12, and the encoder 12 is in a standby state in which additional recording data can be output.

Here, the encoder 12 performs data processing on the start block of the received data newly received by the interface 10 together with the "0" data generated from the data generating means 23 to create the record data. The standby state for outputting data is entered.

When the encoder 12 is in the standby state, the recording start position detecting means 19 refers to the address data stored in the address memory 15a, and immediately after the existing recording area in which the recording data has already been recorded on the disk. The head position of the unrecorded area is detected.

The head position of this unrecorded area is detected in accordance with the time information of the sub-Q data and the information of the number of the EFM frame in the time information, up to the unit of the sub code frame (set of 98 units of the EFM frame). The EQ frame unit is searched by the sub Q data, and the EFM frame unit is performed by determining the end of the last frame of the recording data recorded on the disc by counting the channel bits by one bit on the basis of the synchronization signal. In addition, it is predetermined to determine how many channel bits a frame consists of.

When the detection of the head position of the unrecorded area is performed, the system clock is gradually switched from the reproduction clock to the reference clock, and the recording data is output from the encoder 12 by the recording control means 18, thereby recording on the disc. Is resumed.

At the time when recording on the disk is resumed, synchronization between the recording data recorded on the disk by the synchronization setting means 20 and the recording data output from the encoder 12 is adopted.

Therefore, the start block of the received data newly received by the interface 10 is processed with "0" data generated from the data generating means 23 to create record data, and the record data is recorded on the disc. It is additionally recorded on the disc from a position continuous at the end of the data. Subsequently, subsequent received data is sequentially processed by the encoder 12, modulated into recording data, and recorded on the disk.

The "0" data required after the end block of the received data immediately before the recording stop to the disc and before the start block of the received data immediately after the release of the recording stop to the disc are two blocks, respectively. Since "0" data for two blocks are used together, only "0" data for two blocks is recorded as a joint portion of the recording data before and after the recording of the disc is stopped in both the end block and the start block. As a result, only these two blocks are wasted without extra use on the disc.

In more detail, the apparatus of the present invention, as shown in Fig. 2, identifies the terminal block 110 of the received data 100 immediately before the stop, at the time of recording stop, to secure the interleaved length. Block 150 of data "0" is supplemented by two blocks, and when recording is resumed, two blocks of block 150 of specific data "0" are supplemented before the start block 120 of the received data 100 immediately after the restart. have. Here, in the apparatus of the present invention, the recording operation immediately before the recording stop and immediately after the recording resume is performed so that the pair of supplemented data blocks 150 occupy the same position in the entire data stream 200 (i.e., the data stream at the time of reproduction). Controlled.

That is, for example, when recording is performed after the end block of the received data immediately before the recording stop by CIRC processing of two blocks of "0" data, the frame containing the maximum delayed data among the data of the end block is recorded. The recording operation ends at. Therefore, "0" data not used up to that point is not recorded on the disc. Similarly, when CIRC processing and recording two blocks of "0" data before the start block of the received data immediately after the release of recording stop, the frame is first recorded to the disc when the frame containing the data of the start block is detected. The actual recording operation is started. Frames before that point are not recorded on the disc. According to this processing, of the "0" data supplemented for securing the interleave length, two blocks are actually recorded on the disk. In the write process control of the present invention, additional recording is possible with less effort than the packet write method (requires 7 block blocks).

In the case of reproducing the recording data from the disc, the processing of the "0" data recorded in the seam portion of the recording data before and after the recording is stopped is processed to eliminate the influence of the "0" data.

Since "0" data is recorded continuously for two blocks, the seam portion of the recording data can be easily detected by detecting "0" data for two blocks. Therefore, it is easily achieved by skipping and processing the "0" data of the joint, and obtaining the original data.

By the way, the recording control means 18 sets the recording stop state for stopping recording on the disc and the recording state for recording on the disc, in accordance with the data capacity stored in the buffer RAM 13.

Recording stop to stop recording to disk by the recording control means 18 until the data capacity stored in the buffer RAM 13 is a range in which data can be recorded in advance, and a predetermined allowable amount of recording is allowed. It is set to the state, and the buffer control means 17 stops reading the data to the buffer RAM 13 and only writes the data.

In addition, when the recording stop state is set by the recording control means 18, the supply of operating power to each circuit surrounded by the broken line in FIG. 1 is cut off by the power supply control means 21, and the data by the encoder 12 The modulation processing operation, the recording operation to the disk, the reading operation of the data from the disk, and the reproduction processing operation of the read data of the disk are stopped.

Therefore, when the recording stop state is set, power consumption in each circuit surrounded by the broken line in FIG. 1 is reduced.

Here, in the recording stop state, the motor servo circuit 9 maintains the rotation speed just before the recording stop state to control the disk motor 8.

This control is disadvantageous from the viewpoint of reducing the power consumption, but can shorten the period from the transition to the recording state to the rotational speed suitable for recording on the disk, and the period until the recording of the disk is resumed. It can shorten.

When the data capacity stored in the buffer RAM 13 becomes full of the recording allowable amount, the recording stop state is released by the recording control means 18 and is set to the recording state.

When the recording state is set to the recording state, the operation power supply is resumed by the power supply control means 21 to each circuit surrounded by the broken line in FIG. 1, and the modulation processing operation of the data by the encoder 12, recording operation on the disc, The reading operation of the data from the disc and the reproduction processing operation of the read data of the disc are resumed.

Therefore, the data stored in the buffer RAM 13 is modulated by the encoder 12, converted into recording data, and then recorded on the disk via the optical head 1.

In such a configuration, when the recording stop on the disk is performed by the reception termination of the reception data, and when additional recording is performed on the disk by the reception restart of the new reception data, the &quot; Since the interleaved length required for CIRC processing is ensured by 0 "data, the data processing of the end block of the received data received immediately before the recording stop can be performed by the encoder 12 without failure, and immediately after the recording stop is released. The data processing of the start block of the received received data can be performed by the encoder 12 without failure.

As a result, recording stop is performed after all of the end blocks of the received data received immediately before the recording stop are modulated to the recording data and recorded on the disc, and all of the start blocks of the first received data received after the recording stop are recorded. After the data has been modulated, further recording of the disc is started.

The additional recording of the recording data is performed from a position continuous to the end of the recording data recorded until immediately before the recording stop.

Also, when the power supply of the disc recording apparatus main body is cut off once, and additional recording is performed on the disc after the power is turned on again, the end block of the received data immediately before the recording stop and the start block of the received data immediately after the release of the recording stop are also applied. The interleaved length is ensured by the &quot; 0 &quot; data generated by the data generating means 23, and data processing of the end block and the start block can be performed by the encoder 12 without failure.

At this time, the address of the last recorded data is recorded in a predetermined place on the disc. The location where the address is recorded is determined in advance by the format of the disc.

When additional writing to the disc is performed after the power is turned on again, the address data stored in the address memory 15a is cleared. In this state, the recording start position detecting means 19 accesses the predetermined place on the disk, acquires the address of the recording data last recorded on the disk, and references the address data of the disk on which the recording data is not recorded. The head of the unrecorded area is detected.

When the head of the unrecorded area of the disc is detected, additional recording of the recording data starts from the head of the unrecorded area by the control by the recording control means 18.

Therefore, new record data is continuously recorded additionally without interruption at the end of the record data recorded on the disc.

As described above, the present invention generates specific data from the data generating means when the recording stop on the disk is performed by the reception termination of the reception data, and when additional recording is performed on the disk by the reception resume of the new reception data. The interleaved lengths of the end block of the received data immediately before the recording stop and the start block of the received data immediately after the release of the recording stop are secured. The start block of the received received data can be modulated into record data without any problem and recorded on the disc, and new record data can be additionally recorded continuously without a link block on the record data recorded on the disc.

Claims (6)

A disc recording apparatus for recording record data onto a disc, A data processing circuit for generating data to be recorded on a disc by receiving data in units of blocks and integrating the received data by predetermined blocks to perform predetermined data processing, wherein the predetermined data processing includes interleaving. A data processing circuit including error correction processing A recording controller for controlling recording stop and recording stop of recording data on the disc; A data generator for generating predetermined preset data irrelevant to the received data And The data processing circuit, When performing the data processing with the end block of the received data immediately before the recording stop on the disc, by using the specific data generated from the data generator, the interleaved length of the end block is secured, And the interleaved length of the start block is ensured by using specific data generated from the data generator when performing the data processing on the start block of the received data immediately after the recording stop on the disc is stopped. The recording start position detector according to claim 1, further comprising: a recording start position detector for detecting a position following the end of recording data recorded on the disk immediately before recording stop, as a recording start position on the disk; Synchronization setter for synchronizing the recording data additionally recorded on the disc after the recording stop is synchronized with the recording data recorded on the disc just before recording stop. And And recording data synchronized with the synchronization setter from the recording start position detected by the recording start position detector when the recording stop is released. The address memory according to claim 1, further comprising: an address memory for storing an address of final data of write data output from said data processing circuit immediately before a write stop; A recording start position detector for obtaining a recording start position on the disc when recording stop is released based on the address stored in the address memory; And And recording data is additionally recorded from the recording start position detected by the recording start position detector when the recording stop is released. A disk recording apparatus as claimed in claim 1, wherein said specific data is data consisting of a series of values "0". 2. The recording controller according to claim 1, wherein the recording controller is configured such that the specific data applied to the end block of the received data immediately before the recording stop and the specific data applied to the start block of the received data immediately after the release of the recording stop are performed. And a recording operation on the disc immediately before the recording stop and immediately after the release of the recording stop so as to occupy the same position on the disc. The motor of claim 1, wherein the motor rotates the disk; Servo circuit which maintains the rotational speed of the motor at the rotational speed immediately before recording is stopped while the recording on the disk is stopped by the recording controller. Disc recording apparatus comprising a.